ES5 - 面向对象编程

1. 创建对象的几种方式

/**
 * 普通方式
 */

var obj = {};
obj.name = ‘XingyaZhao‘;
obj.age = 23;
obj.intro = function () {
    return "My name is " + this.name + ", and I‘m " + this.age + ".";
};

alert(obj.intro());

/**
 * 工厂模式
 */

function createObject(name,age) {
    var obj = {};
    obj.name = name;
    obj.age = age;
    obj.intro = function () {
        return "My name is " + this.name + ", and I‘m " + this.age + ".";
    };
    return obj;
}

var obj1 = createObject(‘XingyaZhao‘,23);
var obj2 = createObject(‘HailinWang‘,22);
alert(obj1.intro());
alert(obj2.intro());

/**
 * 构造函数方式
 */

function Person(name, age) {
    this.name = name;
    this.age = age;
    this.intro = function() {
        return "My name is " + this.name + ", and I‘m " + this.age + ".";
    };
}

var zhao = new Person(‘XingyaZhao‘,23);
var wang = new Person(‘HailinWang‘,22);
alert(zhao.intro());
alert(wang.intro());

构造函数方式与工厂模式的区别

1.构造函数没有new Object，但它后台会自动var obj = new Object2.this就相当于obj3.构造函数不需要返回对象引用，它是后台自动返回的

构造函数方式的规范

1.构造函数也是函数，但函数名第一个字母大写2.必须通过 new 构造函数名() 来创建对象，new Person()